Tool-holder.



N. H. GROFF.

TOOL HOLDER.

APPLICATION HLED APR.17. 9l8- Patented Dec. 17, 1918.

/ INVENTOR WITNESSES A Tf Wm/IHG/Wff HTORNEYS AEDMQKIEI,

1 b all whom it may cmmirn Be it known that l, No. 1 Gnorr, a citizen oi the United States, and a resident of Ardniore, in the county of lilontgoinory and State of Pennsylvania, have invented a new and Improved Tool-Holder, of which the following is a description.

Mv invention relates to tool holders and relates more particularly "to that form of tool holder employing cross slide arranged to receive the tool, and adapted to be adgusted transversely to the axis of rotation. of the holder. The invention especially is intended for-embodiment in that type of tool holder adapted to be held in a block Carried on a revolving turret which moves toward the work, the work being rotated in or by a chuck or the like.

The prime object of my invention is to provide means of simple construction and arrangement for adjusting the cross slide and means to secure the slide in adjusted position in a manner that a micron'ietric-adjustment may be readily effected, and the cross slide rigidly clamped in the adjusted position and without liability of disturbing the adjustment while i-lan'iping".

Reference is to be had to the accompanying drawings forming a part of this specification.

Figure 1 is a side elevation of a tool holder embodying my invention;

, Fig. is a plan \lOW thereof;

Fig. 3 is a longitiulinal vertical section on the line 3-3, Fig.

My improved tool holder includes a head 10 having means to secure it to a driving mechanism, there being shown a .shank 11 adapted to e secured to a block A of a tun rel, a portion of said block bein conventionally indicated in Fig. l. The head 10 is slotted hmgitlulinallv at the center as at 12 and recessed in front of the slot. thereby producing clamp jaws 13 which are oppositely beveled on their inner faces at the front portions of the jaws. thereby forming a dovc-tail slidcway. transverse lamp screw 14- cxtends through the head 10 in a. bore transeclinr the slot l2. said screw acling to draw the jaws 13 together for clamping.

A cross slide 15 on the front oi' the head 10 is adapted to receive a. tool, (not shown), for which purpose said cross slide has a groove or slot if; in the front, 1.1 e being laterally are: laiilil 17, 1913. Serial No. Z EJSSQ.

disposed clamp screws 1? to bind the tool in position. The cross slide 15 has on the back thereof a dovetail rib 18 adapted to be engaged by an adjusting screw 19 disposed transversely to the 212518 of the holder, at right angles to the clamp screw 1%. The screw- .19 is accommodated in a bore 20 forn'ied partially in the head 10 between the jaws 13 and partially in the dove-tail rib 18, said rib having thread members to engage the threads of the screw-19, whereby said rib constitutes a half nut." At the ends of the bore 20 counter-bores 21,22 are produced. 011.0116 end of the adjusting screw 19 is a head 23 and on the opposite end is threaded a collar 2% which is fixed in the adjusted position by a cotter pin 27 or the like. The head 10 at the ends of the bore 20 presents shoulders or Countenbores 25, 26 against which the inner sides of the head 23 and collar 24; come to a bearing, whereby to prevent any lon itudinal movement of" the screw 19 relative y to the head 10.

The bottom walls of the counter-bores 21, 22 are. adapted to engage respectively the in ner faces of the head or the collar 24 to limit the ad ustment ofthe cross slide 15 by the turning; of the adjusting screw 19. For turning said screw any means may be pro .idcd, the head 23 in the illustrated example having a squared socket 28 to receive a squared wrench head. On the head 23 of the screw at the base thereof is an annular series of graduations 29, the number of said graduations and thepitch of the threads on the screw determining the fineness of adjust ment.

l lith the described construction it will be seen that a turning of the screw 19 may effect any desired transverse adjustment of the tool holding cross slide.15 and the cross slide having been accurately adjusted the slight turning up of the clamp bolt 14 will firmly bind the jaws 13 onto the rib 18, thereby securely holding the cross slide in any given adjustment. 7

I would state in conclusion that While the illustrated example constitutes a practical embodiment of my invention, I do not limit myself strictly to the mechanical details herein illustrated, since manifestly the same can be considerably varied without departure from "the spirit of the invent-ion as defined in .the appended claims.

Having thus described my invention, I

of the cross slide and claim as new, and desired to secure by Letters Patent V 1. A tool holder including a head, means to secure the'same to the driving mechanism, said head having a central longitudinal slot and being recessed in front of the slot thereby forming yieldable iaws on the head, the opposed ends thereof being oppositely beveled forming a dove-tail slideway, a cross "slide, means-to clamp a tool in said cross slide at the front thereof, a dove-tail rib on the back fitting said slideway, said head, between the jaws thereof, and the said dove-tail block having a bore'transverse to the axis of the tool and extending partially in the'head andipart-ially in said rib, said rib having threml lmembers thereon at said bore toconstitute a half nut, there being eountel boresat the ends of said bore, an'adjusting screw in said bore and engaging the threads on the dove-tail rib to shift the eross slide by a turning of the screw, a head on one end of said screw, a removable collar on the opposite end of the screw, the bottom walls of said counter-bores being adapted to limit the adjustment inner faces of the jaws at the front engage said head and eollafm-respectively, to of the-cross slide, and a clamp screw passing transversely through the head at its slotted portion at right angles to the achusting screw to clamp the jaws onto the dove-tail rib when the cross slide is adjusted.

, 2. In a tool holder, a head adapted to be secured to a driving mechanism, dove-tail clamp iaws on the head at the front and integral therewith, a cross slide on the head at the rib on the cross slide between said ja-ws, a

transverse adjusting screw partially aecom-- modated in said rib and partially in said head between the jaws, the threads of the screw being out of engagement with said head, coacting means respectively on the ends of said screw and on said head to hold the screw against longitudinal movement, said rib having thread members and constituting a half nut, and a clamp screw for front adapted to hold a tool, a-dovetail' the jaws and extending transversely thereto v at right angles to the adjusting screw.

NOAH n. onorr. 

